target: msm8974: Add support for 8994 interposer

Add support for 8994 interposer board, this needs disabling display
usb3 support and detect the new subtype for interposer board.

CRs-Fixed: 663154
Change-Id: Ia52243ddcc78df63da5a8da71df3de5546970fef
diff --git a/target/msm8974/target_display.c b/target/msm8974/target_display.c
index 57973bb..e399e03 100755
--- a/target/msm8974/target_display.c
+++ b/target/msm8974/target_display.c
@@ -394,6 +394,9 @@
 	uint32_t panel_loop = 0;
 	uint32_t ret = 0;
 
+	if (target_hw_interposer())
+		return;
+
 	panel_name += strspn(panel_name, " ");
 
 	if (!strcmp(panel_name, HDMI_PANEL_NAME)) {